Spring boot Jpa findAll Hibernate query returns empty - spring-boot

Question

I am working on a simple personal project in order to learn SpringBoot.
Project Overview: Spring Boot aplication that gets data and inserts data through RestController endpoint into a MariaDb instance on a docker.
My MariaDb table is this:
\+------------------+------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
\+------------------+------------+------+-----+---------+----------------+
| ACCOUNT_ID | int(11) | NO | PRI | NULL | auto_increment |
| ACCOUNT_VALUE | int(11) | YES | | 0 | |
| ACCOUNT_CURRENCY | varchar(5) | YES | | NULL | |
\+------------------+------------+------+-----+---------+----------------+
My table has data (I inserted it manualy from the terminal):
MariaDB \[dev\]\> select \* from CUSTOMER_ACCOUNT;
\+------------+---------------+------------------+
| ACCOUNT_ID | ACCOUNT_VALUE | ACCOUNT_CURRENCY |
\+------------+---------------+------------------+
| 1 | 300 | RON |
| 2 | 300 | RON |
| 3 | 300 | RON |
| 4 | 300 | RON |
| 5 | 300 | RON |
| 6 | 300 | RON |
| 7 | 300 | RON |
| 8 | 300 | RON |
| 9 | 300 | RON |
| 10 | 300 | RON |
| 11 | 300 | RON |
| 12 | 300 | RON |
| 13 | 300 | RON |
| 14 | 300 | RON |
| 15 | 300 | RON |
| 16 | 300 | RON |
| 17 | 300 | RON |
| 18 | 300 | RON |
\+------------+---------------+------------------+
My Entity class is this:
#Entity
#Table(name = "CUSTOMER_ACCOUNT", schema = "dev", catalog = "")
public class CustomerAccountEntity {
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Id
#Column(name = "ACCOUNT_ID")
private int accountId;
#Basic
#Column(name = "ACCOUNT_VALUE")
private Integer accountValue;
#Basic
#Column(name = "ACCOUNT_CURRENCY")
private String accountCurrency;
public int getAccountId() {
return accountId;
}
public void setAccountId(int accountId) {
this.accountId = accountId;
}
public Integer getAccountValue() {
return accountValue;
}
public void setAccountValue(Integer accountValue) {
this.accountValue = accountValue;
}
public String getAccountCurrency() {
return accountCurrency;
}
public void setAccountCurrency(String accountCurrency) {
this.accountCurrency = accountCurrency;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CustomerAccountEntity that = (CustomerAccountEntity) o;
return accountId == that.accountId && Objects.equals(accountValue, that.accountValue) && Objects.equals(accountCurrency, that.accountCurrency);
}
#Override
public int hashCode() {
return Objects.hash(accountId, accountValue, accountCurrency);
}
}
My repository class is this :
#Repository
public interface CustomerAccountRepository extends JpaRepository\<CustomerAccountEntity,Long\> {
#Query("Select ca.accountId, ca.accountValue, ca.accountCurrency from CustomerAccountEntity ca")
List<CustomerAccountEntity> findAllCA();
}
My settings is this:
# connect via localhost on port 3306
spring.datasource.url=jdbc:mariadb://localhost:3306/dev
spring.datasource.username=root
spring.datasource.password=mypass
spring.jpa.properties.hibernate.globally_quoted_identifiers=true
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.show-sql=true
spring.datasource.driver=cdata.jdbc.mariadb.MariaDBDriver
When I hit the controller to retrieve all the data it returns empty in browser.
I attempted to play with the settings to change the driver and hibernate dialect. Note: I do have a succesfull conection to the DB
When I start the aplication there pops up a new table in mariadb
| Tables_in_dev |
+------------------+
| CUSTOMER_ACCOUNT |
| customer_account |
+------------------+
2 rows in set (0.000 sec)
Hibernate calls goes to the lower case ones, but this one is empty. It seems it is deleted when I stop the app.
I am still learning... but can someone explain what is happening.

Answer 1

spring.jpa.hibernate.ddl-auto=create-drop;
having this in your properties file will drop all existing content in your table each time you restart or run your spring-boot application.
To keep all records in your tables change to spring.jpa.hibernate.ddl-auto=update;

Answer 2

Your repo has Long as id type while entity has int. Try to make them both of the same type Long
To avoid data loss while using mariadb in docker, you should create a docker volume and plug it to /var/lib/mysql/data when you create your container